For now and after seeing episode 11 we can see that L has the upper hand even though a new stronger kira appeared . I believe that L will also has some kind of a hidden power like light's otherwise if L keeps having the upper hand and comes close 99% to capture Light, Light will have no choice than making that eye deal with Ryuuk and he will know L's real name and kill him so there will be no point of L in the series without him having strong power as well. It's just a guess, maybe i'm wrong